Implementing CANopen => Help

Hope you already looked at the information provided at:

After study all these documents, you should be able to implement CANopen from scratch. But be aware, CANopen has many faces, man extensions and features. You should know the goal before starting. And - please excuse - without a lot of experience in CAN already, embedded computing, other automation protocols and systems, look for a commercial available product. Gives you more long term satisfaction.

Regards Heinz

Maybe a search at sourceforge.net helps. Peter

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Are you building a CanOpen master of just a slave ? If you are making a slave, do you need to pass the interoperability test or make a device that works in some specific systems ?

For a simple slave, look at the "predefined connection set" and if it is sufficient, a lot of the OD stuff can be hardwired. At a minimum, you will have to handle the NMT (start/stop), PDO:s and answer some expedited (single frame) SDO request with a constant single frame reply. You need the ability to set the node number on the device, since it affects the CAN identifier numbering.

You are gong to need the OD, if you intend to implement a CanOpen master with freely configured nodes (slaves). Usually you start by reading the EDS (Electronic Data Sheet) files for each node type or the DCF file for each individual node and build some tree structure in memory to hold this data.

Paul

Thanks for the links. I had seen the can-cia page already, but the wiki page is new to me. I'll take a look at that.

I'm doing it as part of a final-year project, so I don't have much choice as regards getting a commercial solution :-P

Gerard.

In your case, doing it as a school project, you have to do it by yourself, thats right. In this case write clearly down your requirements. Start looking what the standard DS301 declares as mandatory. It should be possible to implement this in reasonable amount of time.

Heinz